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Theorem eldm1cossres2 35700
Description: Elementhood in the domain of restricted cosets. (Contributed by Peter Mazsa, 30-Dec-2018.)
Assertion
Ref Expression
eldm1cossres2 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵   𝑥,𝑅   𝑥,𝑉

Proof of Theorem eldm1cossres2
StepHypRef Expression
1 eldm1cossres 35699 . 2 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝑥𝑅𝐵))
2 elecALTV 35526 . . . 4 ((𝑥 ∈ V ∧ 𝐵𝑉) → (𝐵 ∈ [𝑥]𝑅𝑥𝑅𝐵))
32el2v1 35489 . . 3 (𝐵𝑉 → (𝐵 ∈ [𝑥]𝑅𝑥𝑅𝐵))
43rexbidv 3297 . 2 (𝐵𝑉 → (∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅 ↔ ∃𝑥𝐴 𝑥𝑅𝐵))
51, 4bitr4d 284 1 (𝐵𝑉 → (𝐵 ∈ dom ≀ (𝑅𝐴) ↔ ∃𝑥𝐴 𝐵 ∈ [𝑥]𝑅))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wcel 2110  wrex 3139  Vcvv 3494   class class class wbr 5065  dom cdm 5554  cres 5556  [cec 8286  ccoss 35452
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5202  ax-nul 5209  ax-pr 5329
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4567  df-pr 4569  df-op 4573  df-br 5066  df-opab 5128  df-xp 5560  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-ec 8290  df-coss 35658
This theorem is referenced by:  eldmqs1cossres  35892
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